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gflLoadThumbnail > background color?
Posted: Thu Jun 24, 2010 9:02 am
by AmigoJack
When I use...
Code: Select all
iError:= gflLoadThumbnail( 'filename.gif', 100, 100, @pBmp, @vLoadParam, vFileInfo );
...to load a picture as thumbnail I have no control on which background color is used to fill the canvas up to 100x100 pixel. It seems like
pBmp^.ColorMap^.Red/Green/Red/Alpha[0] is most commonly used (noticed this because the color was not always black) and
not the color indexed by
pBmp^.TransparentIndex.
Is there any way to also directly give a GFL_COLOR to use for the canvas/background?
Re: gflLoadThumbnail > background color?
Posted: Fri Jun 25, 2010 9:49 am
by xnview
You can use GFL_LOAD_PREVIEW_NO_CANVAS_RESIZE and make your own CanvasResize...
Re: gflLoadThumbnail > background color?
Posted: Mon Jun 28, 2010 5:41 am
by AmigoJack
Code: Select all
var
vWhite: GFL_COLOR;
iError: GFL_ERROR;
begin
...
iError:= gflLoadThumbnail( 'filename.gif', 100, 100, @pBmp, @vLoadParam, vFileInfo );
if iError<> GFL_NO_ERROR then exit;
vWhite.Red:= 255;
vWhite.Green:= 255;
vWhite.Blue:= 255;
vWhite.Alpha:= 0;
iError:= gflResizeCanvas( pBmp^, nil, 100, 100, GFL_CANVASRESIZE_CENTER, @vWhite );
...works as intended on most pictures: the canvas is extended with a white color.
But on these two images there is still a black color used.
How can I avoid/replace the black color?
Re: gflLoadThumbnail > background color?
Posted: Tue Jun 29, 2010 9:09 am
by xnview
Ok, a bug!